Counter ASIC 3.0: the identities job's ${appDir}: fix and the class guard tools/ci/ps-drive-ref-check.sh in CI (a $name: inside a double-quoted string is a PowerShell 5.1 parse error; backtick-escaped dollars ignored)

.github/workflows/ci.yml

@@ -67,6 +67,8 @@ jobs:
         run: bash tools/ci/identity-check.sh
       - name: no conflict markers in tracked files
         run: bash tools/ci/no-conflict-markers.sh
+      - name: PowerShell drive-reference check (a `$name:` inside a double-quoted string is a 5.1 parse error)
+        run: bash tools/ci/ps-drive-ref-check.sh
       - name: copied sources are re-stamped before a build
         run: bash tools/ci/copied-sources-check.sh
       - name: override params files parse with no duplicate key (the duplicate-field class, 6 October 2026)

tools/ca3-pc1-amd/pc1-amd-identities.ps1

@@ -21,7 +21,7 @@ $appDir = if ($env:IGNEUM_APP_DIR) { $env:IGNEUM_APP_DIR } else { Join-Path $env
 $urlFile = Join-Path $appDir 'app.url'
 $base = $null
 if (Test-Path $urlFile) { $base = (Get-Content -LiteralPath $urlFile -Raw).Trim().TrimEnd('/') }
-if (-not $base) { "RESULT identities error=no app.url under $appDir: nothing posted"; Summary 'failed' @{ reason = 'no app.url' }; exit 1 }
+if (-not $base) { "RESULT identities error=no app.url under ${appDir}: nothing posted"; Summary 'failed' @{ reason = 'no app.url' }; exit 1 }
 
 $wantKey = 'amd:gfx1201'
 $wantIdent = 8

tools/ci/ps-drive-ref-check.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+# The drive-reference class (6 October 2026): in Windows PowerShell 5.1 a double-quoted string holding `$name:` followed
+# by a character that is not a path separator is parsed as a drive-qualified variable (`$name:rest`), which is a parse
+# error at script start ("Variable reference is not valid"): the identities job run-ca3-pc1-amd-identities-20261006
+# failed in 0 s on `"... under $appDir: nothing posted"`. Rule: write `${name}:` or `$($name):`. This check fails CI on
+# any .ps1 whose double-quoted strings hold `$name:` where name is not a PowerShell scope or drive (env, script,
+# global, local, private, using, function, variable, alias, Env).
+set -euo pipefail
+cd "$(dirname "$0")/../.."
+python3 - <<'PY'
+import re, subprocess, sys
+files = subprocess.check_output(['git', 'ls-files', '*.ps1', '**/*.ps1'], text=True).split()
+ok_names = {'env', 'Env', 'ENV', 'script', 'global', 'local', 'private', 'using', 'function', 'variable', 'alias'}
+pat = re.compile(r'(?<!`)\$([A-Za-z_][A-Za-z0-9_]*):(?![\\/:])')  # a backtick-escaped `$ is a literal dollar (here-strings that generate bash)
+fail = 0
+for f in sorted(set(files)):
+    for n, line in enumerate(open(f, encoding='utf-8', errors='replace'), 1):
+        if line.lstrip().startswith('#'): continue
+        for seg in re.findall(r'"(?:[^"\\]|\\.|`")*"', line):
+            for m in pat.finditer(seg):
+                if m.group(1) in ok_names: continue
+                print(f'ps-drive-ref: {f}:{n}: `${m.group(1)}:` inside a double-quoted string parses as a drive-qualified variable in PowerShell 5.1; write `${{{m.group(1)}}}:`')
+                fail = 1
+if not fail: print(f'ps-drive-ref: {len(set(files))} .ps1 files, no `$name:` inside a double-quoted string')
+sys.exit(fail)
+PY